Sylvan Arms SA5 Pro AR-15 Steel Folding Stock Adapter, Heavy Duty Pistol Buffer Tube Kit

Sylvan Arms SA5 Pro AR-15 Steel Folding Stock Adapter with Heavy Duty Pistol Buffer Tube Kit

The Sylvan Arms SA5 Pro folding stock adapter is machined from 4140 steel and provides right side folding capability for AR-15 platforms. This adapter is engineered to be 250 percent stronger than the Gen4 model and features adjustable hinge tension for precise folding feel. The design maintains rigidity when locked open and allows the rifle to fold for compact storage and transport. Two integrated quick detach sling points are built into the adapter body for mounting flexibility. This kit includes a heavy duty aluminum pistol buffer tube designed for AR-15 and AR style pistols. Made in the USA with a 1045 steel bolt extension for seamless compatibility with standard AR-15 bolt carrier groups.

Key Features

• CNC machined from 4140 steel with 250 percent strength increase over Gen4 adapter
• Right side folding design with adjustable hinge tension and improved locking mechanism
• Two integrated quick detach sling mounting points
• Heavy duty aluminum pistol buffer tube for AR-15 and AR style pistols
• 1045 steel bolt extension included for standard AR-15 BCG compatibility
• Compatible with mil-spec AR-15, most AR-10 builds, and 9MM BCGs with 0.625 ID

Perfect For

• Shooters prioritizing compact storage and transport options
• Those wanting a folding capability without sacrificing strength
• Builders working with pistol configurations who need buffer tube flexibility

4140 Steel Construction and Strength

The SA5 Pro adapter is CNC machined from 4140 steel rather than aluminum. This material choice provides significantly higher tensile strength and impact resistance compared to aluminum adapters. The 4140 steel construction delivers 250 percent more strength than the Gen4 model, which makes it well suited for repeated folding cycles and hard use. The adapter maintains mil-spec buffer tube threads and interfaces cleanly with standard AR-15 lower receivers. The included 1045 steel bolt extension ensures compatibility with standard AR-15 bolt carrier groups.

Right Side Folding Design

The adapter folds to the right side of the rifle, which keeps the ejection port and charging handle accessible even when folded. The firearm should not be fired when folded. The hinge mechanism features adjustable tension so you can dial in how tight or loose the folding action feels. The improved locking mechanism secures the adapter firmly when locked open. When locked, the adapter maintains rigidity and does not introduce flex into the buffer system. The folding capability reduces overall length for storage in bags, cases, or vehicle compartments without requiring removal of the stock or brace.

Heavy Duty Pistol Buffer Tube

The included heavy duty pistol buffer tube is made from aluminum and designed specifically for AR-15 and AR style pistols. This buffer tube pairs with the folding adapter and provides a solid platform for attaching pistol braces or other accessories. The aluminum construction keeps weight manageable while maintaining strength for pistol caliber and rifle caliber applications.

Installation and Compatibility

The adapter is compatible with mil-spec AR-15 platforms, most AR-10 builds, and 9MM bolt carrier groups with 0.625 ID after removing the rear pin and weight. The 1045 steel bolt extension allows the adapter to work seamlessly with standard AR-15 bolt carrier groups without requiring a specialized BCG. This adapter is not compatible with Tippmann 22 or LWRC pistols. The adapter uses standard 1-3/16 x 16 threading for mil-spec buffer tube attachment. Two quick detach sling mounting points are machined directly into the adapter body and accept standard push button sling swivels.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable laws. Do not fire the firearm while folded. Verify compatibility with your lower receiver before installation. This adapter is designed for AR-15 platforms and may be compatible with some AR-10 builds.